Votes of area members of Congress on key roll calls for the week ending March 25, 1977. HOUSE

Common-Site Picketing. By a 205-217 vote, the House defeated a bill which would have allowed building trades unions to picket an entire construction site in a dispute with only one subcontractor on that site. The measure had included exclusions for only low-rise residential buildings and other construction already underway.

Passage of the bill would have overturned a 1951 Supreme Court ruling forbidding such picketing as illegal secondary boycotts. Provisions in the bill would also have set up a government sponsored committee to oversee and assist the collective bargaining process in the construction industry.

A nearly identical bill cleared Congress in December 1975, but was vetoed by former President Ford. President Carter had said he would sign such a bill but would not actively work for its passage.

Supporters of common-site picketing said that it was necessary to give construction workers equal picketing rights with organized workers in industry. They said that all contractors working on a common site were engaged in a joint venture - and thus were involved in each other's labor disputes.

Opponents argued that the bill gave building trades unions a dangerous and powerful new economic weapon which would be used to force all construction workers to join unions. The bill would also result in higher construction costs, opponents said, by producing more strikes and more expensive settlements and by reducing competition between union and non-union workers.

In view of the House vote, it is highly unlikely the Senate will consider the bill.

Voting to allow common-site picketing: MARYLAND - Mikulski (D), Mitchell (D), Spellman (D).

Voting not to allow common-site picketing: MARYLAND - Bauman (R), Byron (D), Holt (R), Long (D), Steers (R). SENATE

Outside Income Limit. By a 35-62 vote, the Senate refused to delete an ethics code provision limiting the amount of money a senator could earn at jobs outside the Senate to 15 per cent of a senator's official salary (or $8,625 at the new salary level of $57,500).

The provision does not apply the limit to unearned income such as dividends from stocks or bonds, or to proceeds from family farms or businesses. Therefore, the primary effect of the limit is to reduce the ability of senators to earn money by speaking to groups or writing articles for fees.

Backers of the 15 per cent limit on outside earned income said that it was needed to prevent senators from collecting large fees from special interest groups and to force senators to devote full time to their official duties.

Opponents of the income limitation argued that full disclosure of all speaking fees and other income was enough to ensure against possible conflicts of interest and that the limit would discriminate against senators without large amounts of personal wealth.

Voting to remove limit on outside earned income: MARYLAND - Mathias (R).

Voting not to remove limit on outside earned income: MARYLAND - Sarbanes (D).

Unofficial Office Accounts. The Senate voted 47-43 to table, and thus to kill, an amendment to the proposed code of ethics that would have prohibited senators from using funds raised for political purposes to help pay for Senate office expenses and other official activities.

Members who favored banning unofficial office accounts argued that official expenses should be paid out of official funds and that political funds should be restricted to political uses.

Opponents of banning the unofficial office accounts maintained that official funds were in many cases inadequate to pay all the costs of maintaining a Senate office, that many functions could not be clearly defined as either political or official and that the use of political funds for official expenses did not constitute a conflict of interest because federal election law requires disclosure of the donors of the funds.

Voting to kill amendment banning unofficial office accounts: MARYLAND - Mathias (R).

Voting not to kill amendment banning unofficial office accounts: MARYLAND - Sarbanes (D).